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Session 3 DHCP Network Design
<ul><li>TCP/IP works on four layers: </li></ul><ul><ul><li>Interface </li></ul></ul><ul><ul><li>Internet </li></ul></ul><u...
Objectives <ul><li>Describe DHCP and its working </li></ul><ul><li>Identify the requirements for a DHCP solution </li></ul...
Dynamic Host Configuration Protocol (DHCP) <ul><li>Automates the allocation of: </li></ul><ul><ul><li>IP addresses </li></...
Features of DHCP <ul><li>The features of DHCP are: </li></ul><ul><ul><li>RFC Compliance  </li></ul></ul><ul><ul><li>Integr...
DHCP Design <ul><li>DHCP can be designed for: </li></ul><ul><ul><li>LAN </li></ul></ul><ul><ul><li>Routed Networks </li></...
DHCP Design for the LAN <ul><li>One DHCP server can support thousands of DHCP clients in a local area network   </li></ul>
DHCP Design for the LAN Contd…  <ul><li>In a single DHCP environment, one scope that contains the entire TCP/IP configurat...
DHCP Design for Routed Network  <ul><li>We have to make use of the DHCP relay agent to forward broadcast requests through ...
DHCP Relay Agent <ul><li>DHCP relay agent is used if: </li></ul><ul><ul><li>No DHCP server is available on that subnet  </...
DHCP Design for Non Microsoft Clients  <ul><li>A network consists of Windows clients and non-Windows based clients.  </li>...
DHCP Design Enhancement  <ul><li>To increase the availability of the DHCP server, we need to: </li></ul><ul><ul><li>Create...
Superscopes on multiple DHCP servers <ul><li>Enables sharing of IP addresses and increase the availability of the DHCP ser...
DHCP Server and Windows Server 2003 Clustering  <ul><li>Provides immediate failover and the service is restarted when an e...
Installing DHCP <ul><li>Installing DHCP involves:  </li></ul><ul><ul><li>Installing and authorizing the DHCP service </li>...
DHCP Administration Security <ul><li>DHCP administrating can be secured by: </li></ul><ul><ul><li>Securing the DHCP servic...
Securing DHCP <ul><li>We can provide security by: </li></ul><ul><ul><li>Authorizing the DHCP Server </li></ul></ul><ul><ul...
Authorization of DHCP Server <ul><li>There must be one DHCP server with the active directory enabled in the network.  </li...
Control User Access using Windows Server 2003 Groups   <ul><li>DHCP administrators are special group that have permissions...
Rogue DHCP Servers  <ul><li>An unauthorized or rogue DHCP server may cause the network to malfunction.  </li></ul><ul><li>...
DHCP in a Firewall Environment  <ul><li>We can reduce unauthorized access by: </li></ul><ul><ul><li>Configuring the reserv...
DHCP Performance <ul><li>DHCP server performance can be increased by: </li></ul><ul><ul><li>Enhancing the single DHCP serv...
Single DHCP Server <ul><li>We can improve the DHCP performance in Windows Server 2003 by:   </li></ul><ul><ul><li>Using mu...
Multiple DHCP Servers   <ul><li>We can enhance the performance of multiple DHCP servers by: </li></ul><ul><ul><li>Having d...
DHCP Server Lease Time <ul><li>If we reduce the lease time, the network traffic increases, though the IP address is releas...
Summary <ul><li>DHCP automates allocation of IP addresses and other networking information </li></ul><ul><li>IP address al...
Summary Contd… <ul><li>DHCP can be secured by stopping rogue servers and using firewalls </li></ul><ul><li>One DHCP server...
Summary Contd… <ul><li>Installing DHCP involves:  </li></ul><ul><ul><li>Installing and authorizing the DHCP service </li><...
Summary Contd… <ul><li>DHCP server performance can be increased by: </li></ul><ul><ul><li>Enhancing the single DHCP respon...
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Session 3 Tp 3

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Transcript of "Session 3 Tp 3"

  1. 1. Session 3 DHCP Network Design
  2. 2. <ul><li>TCP/IP works on four layers: </li></ul><ul><ul><li>Interface </li></ul></ul><ul><ul><li>Internet </li></ul></ul><ul><ul><li>Transport </li></ul></ul><ul><ul><li>Application. </li></ul></ul><ul><li>The subnet mask displays only the network ID. </li></ul><ul><li>Subnets can be created on a physical or logical basis. </li></ul><ul><li>A secure network is one where data and resources are protected effectively. </li></ul>Review
  3. 3. Objectives <ul><li>Describe DHCP and its working </li></ul><ul><li>Identify the requirements for a DHCP solution </li></ul><ul><li>Identify DHCP design possibilities </li></ul><ul><li>Secure the DHCP service </li></ul><ul><li>Identify the methods to enhance the DHCP service </li></ul>
  4. 4. Dynamic Host Configuration Protocol (DHCP) <ul><li>Automates the allocation of: </li></ul><ul><ul><li>IP addresses </li></ul></ul><ul><ul><li>Subnet mask </li></ul></ul><ul><ul><li>Default gateway </li></ul></ul><ul><ul><li>WINS server. </li></ul></ul><ul><li>IP address allocation takes place using four commands: </li></ul><ul><ul><li>DHCPDISCOVER </li></ul></ul><ul><ul><li>DHCPOFFER </li></ul></ul><ul><ul><li>DHCPREQUEST </li></ul></ul><ul><ul><li>DHCPACK </li></ul></ul><ul><li>IP address allocation can be dynamic, automatic or manual </li></ul><ul><li>IP addresses must be renewed periodically </li></ul>
  5. 5. Features of DHCP <ul><li>The features of DHCP are: </li></ul><ul><ul><li>RFC Compliance </li></ul></ul><ul><ul><li>Integration with DNS and Active Directory </li></ul></ul><ul><ul><li>Support for vendor specific options and Multicast addresses </li></ul></ul><ul><ul><li>Integration of Routing and Remote Access </li></ul></ul>
  6. 6. DHCP Design <ul><li>DHCP can be designed for: </li></ul><ul><ul><li>LAN </li></ul></ul><ul><ul><li>Routed Networks </li></ul></ul><ul><ul><li>Non-Microsoft Clients </li></ul></ul>
  7. 7. DHCP Design for the LAN <ul><li>One DHCP server can support thousands of DHCP clients in a local area network </li></ul>
  8. 8. DHCP Design for the LAN Contd… <ul><li>In a single DHCP environment, one scope that contains the entire TCP/IP configuration required for that network, is defined for all the DHCP clients. </li></ul><ul><li>In a multiple DHCP environment, we may need to define one superscope that includes all the scopes. </li></ul>
  9. 9. DHCP Design for Routed Network <ul><li>We have to make use of the DHCP relay agent to forward broadcast requests through the routers to the DHCP servers. </li></ul><ul><li>DHCP client uses the dynamic host communication protocol to communicate with the DHCP relay agent. </li></ul><ul><li>DHCP relay agent sends unicast packets to the DHCP server. </li></ul>
  10. 10. DHCP Relay Agent <ul><li>DHCP relay agent is used if: </li></ul><ul><ul><li>No DHCP server is available on that subnet </li></ul></ul><ul><ul><li>DHCP relay agent can be run on available computers </li></ul></ul><ul><ul><li>Routers do not support DHCP or BOOTP packets </li></ul></ul>
  11. 11. DHCP Design for Non Microsoft Clients <ul><li>A network consists of Windows clients and non-Windows based clients. </li></ul><ul><li>All the clients in the network may require dynamic IP address configuration </li></ul>
  12. 12. DHCP Design Enhancement <ul><li>To increase the availability of the DHCP server, we need to: </li></ul><ul><ul><li>Create superscopes on multiple DHCP servers </li></ul></ul><ul><ul><li>Enable support for Windows Server 2003 clustering solution DHCP server </li></ul></ul>
  13. 13. Superscopes on multiple DHCP servers <ul><li>Enables sharing of IP addresses and increase the availability of the DHCP service </li></ul><ul><li>The load on the DHCP servers is distributed among all the DHCP servers and reduces redundancy by using distributed scopes </li></ul>
  14. 14. DHCP Server and Windows Server 2003 Clustering <ul><li>Provides immediate failover and the service is restarted when an event fails </li></ul><ul><li>Provides quick restoration of failed server as only one DHCP database is referred to </li></ul><ul><li>Enables elimination of distributed scope, which reduces overhead </li></ul>
  15. 15. Installing DHCP <ul><li>Installing DHCP involves: </li></ul><ul><ul><li>Installing and authorizing the DHCP service </li></ul></ul><ul><ul><li>Creating and configuring the scopes to be used </li></ul></ul><ul><ul><li>Setting up optional parameters </li></ul></ul><ul><ul><li>Activating the scopes </li></ul></ul>
  16. 16. DHCP Administration Security <ul><li>DHCP administrating can be secured by: </li></ul><ul><ul><li>Securing the DHCP service </li></ul></ul><ul><ul><li>Identifying and stopping rogue DHCP servers </li></ul></ul><ul><ul><li>Using a firewall </li></ul></ul>
  17. 17. Securing DHCP <ul><li>We can provide security by: </li></ul><ul><ul><li>Authorizing the DHCP Server </li></ul></ul><ul><ul><li>Controlling user access to the configuration files of the DHCP server </li></ul></ul>
  18. 18. Authorization of DHCP Server <ul><li>There must be one DHCP server with the active directory enabled in the network. </li></ul><ul><li>The active directory contains the list of authorized DHCP servers. </li></ul><ul><li>When the other Windows Server 2003 DHCP servers start, they contact the Active Directory DHCP server, and are authorized to lease the IP addresses </li></ul>
  19. 19. Control User Access using Windows Server 2003 Groups <ul><li>DHCP administrators are special group that have permissions for DHCP administration. </li></ul><ul><li>The DHCP Users and special local group permit Read Only access. </li></ul><ul><li>An authorized user can gain access to information on a DHCP server by being a member of the special group. </li></ul><ul><li>A user can be stopped from making any changes to the configuration </li></ul>
  20. 20. Rogue DHCP Servers <ul><li>An unauthorized or rogue DHCP server may cause the network to malfunction. </li></ul><ul><li>Windows Server 2003 supports server authorization when DHCP service is installed. </li></ul><ul><li>The DHCP service is shut down if the DHCP server is not authorized </li></ul>
  21. 21. DHCP in a Firewall Environment <ul><li>We can reduce unauthorized access by: </li></ul><ul><ul><li>Configuring the reserved IP address manually </li></ul></ul><ul><ul><li>Extending the lease duration </li></ul></ul><ul><ul><li>Reducing the available address range </li></ul></ul>
  22. 22. DHCP Performance <ul><li>DHCP server performance can be increased by: </li></ul><ul><ul><li>Enhancing the single DHCP server’s response time </li></ul></ul><ul><ul><li>Using multiple DHCP servers </li></ul></ul><ul><ul><li>Modifying the DHCP lease time </li></ul></ul>
  23. 23. Single DHCP Server <ul><li>We can improve the DHCP performance in Windows Server 2003 by: </li></ul><ul><ul><li>Using multiple CPUs so that the DHCP service can function faster using multithreading </li></ul></ul><ul><ul><li>Enhancing the database so that the query response time can be the best possibl e </li></ul></ul><ul><li>We can improve the DHCP server response time by: </li></ul><ul><ul><li>Adding more than one CPU </li></ul></ul><ul><ul><li>Adding enough memory </li></ul></ul><ul><ul><li>Having high performance disks </li></ul></ul><ul><ul><li>Having high bandwidth network card or many network cards </li></ul></ul>
  24. 24. Multiple DHCP Servers <ul><li>We can enhance the performance of multiple DHCP servers by: </li></ul><ul><ul><li>Having distributed scopes so that the address range is divided between the servers </li></ul></ul><ul><ul><li>Placing a DHCP server on the most populated subnet </li></ul></ul><ul><ul><li>Placing DHCP servers on either side of the WAN link </li></ul></ul><ul><ul><li>Having multi-homed DHCP servers so that network traffic across subnets is minimized </li></ul></ul>
  25. 25. DHCP Server Lease Time <ul><li>If we reduce the lease time, the network traffic increases, though the IP address is released sooner. </li></ul><ul><li>If we increase the lease time, the network traffic decreases and the IP address is released later. </li></ul>
  26. 26. Summary <ul><li>DHCP automates allocation of IP addresses and other networking information </li></ul><ul><li>IP address allocation uses four commands: </li></ul><ul><ul><li>DHCPDISCOVER </li></ul></ul><ul><ul><li>DHCPOFFER </li></ul></ul><ul><ul><li>DHCPREQUEST </li></ul></ul><ul><ul><li>DHCPACK </li></ul></ul><ul><li>DHCP can be designed for LANs, Routed Networks, and non-Microsoft clients </li></ul>
  27. 27. Summary Contd… <ul><li>DHCP can be secured by stopping rogue servers and using firewalls </li></ul><ul><li>One DHCP server can support thousands of DHCP clients in a local area network </li></ul><ul><li>DHCP client uses the dynamic host communication protocol to communicate with the DHCP relay agent </li></ul><ul><li>DHCP relay agent sends unicast packets to the DHCP server </li></ul>
  28. 28. Summary Contd… <ul><li>Installing DHCP involves: </li></ul><ul><ul><li>Installing and authorizing the DHCP service </li></ul></ul><ul><ul><li>Creating and configuring the scopes to be used </li></ul></ul><ul><ul><li>Setting up optional parameters </li></ul></ul><ul><ul><li>Activating the scopes </li></ul></ul><ul><li>DHCP administrating can be secured by: </li></ul><ul><ul><li>Securing the DHCP service </li></ul></ul><ul><ul><li>Identifying and stopping rogue DHCP servers </li></ul></ul><ul><ul><li>Using a firewall </li></ul></ul>
  29. 29. Summary Contd… <ul><li>DHCP server performance can be increased by: </li></ul><ul><ul><li>Enhancing the single DHCP response time of the server </li></ul></ul><ul><ul><li>Using multiple DHCP servers </li></ul></ul><ul><ul><li>Modifying the DHCP lease time </li></ul></ul>
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